This is a photo ( ) my classmate

This is a photo ( ) my classmate This is a photo _____ my classmate.A.in B.of C.at This is a photo ( )my family. This is a photo of my family of,this,class,is,a,my,photo This is a photo of my brother this is a photo of my family 还是this is the photo of my famil This is a photo( ) my friend My ( ) are workers here is a photo of my room.和 this is a photo of my room.区别 here is a photo of my room. 和 this is a photo of my room. 区别 A：This is a photo of my family. A:This is a photo of my family.